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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>CSS 练习</title>
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</head>

<body>
    <header>
        <h1>CSS 练习</h1>
    </header>
    <main>
        <section>
            <h2>使用样式表的三种方式</h2>
            <ol>
                <li>外部样式表</li>
                <li>内部样式表</li>
                <li>内嵌样式表</li>
            </ol>
        </section>
    </main>
    <footer></footer>
</body>

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